单项选择题
A．throwing stones often caused injuries B．throwing stones was not fun C．games with stones did not have rules D．rocks were too heavy to throw
A．Because he didn’t like cutting hair any longer. B．Because he was too old to cut hair. C．Because he wouldn’t like Roger to go there. D．Because a young man wanted to buy his shop.
A．Animals are very skillful at a circus. B．They are big and strong. C．Some animals are as clever as human beings. D．Animals can be trained because they like to get something as a rewar